93 



148. Singh, K., W. M. Narang, and H. K. Sharma. I967. Effect of crop 



sequence and fertilizers on maize. J. of Res. Punjab Agr. 

 Univ. 4:500-507. 



149. Singh, R. P., D. S. Nandal, and L. Singh. 1973' Economic analysis 



in multiple cropping in Haryana. In Symposium on Multiple 

 Cropping. Indian Soc. of Agron. (eds.), New Delhi. 



150. Southeastern Fruit and Vegetable Report. I978-79. Georgia Dept. 



of Agr. Market Div. Federal State Market News. Georgia 

 State Farmers Market, Thomasville, GA. 



151. Standifer, L. G., and M. N. Ismail. 1975> A multiple cropping 



system for vegetable production under subtropical, high rain- 

 conditions. J. Amer. Soc. Hort. Sci. 100:503-506. 



152. Stephens, D. 1969' Changes in yield and fertilizer responses with 



continuous cropping in Uganda. Expt. Agr. 55 263-269. 



153. • 1969- The effects of fertilizers, manures and trace 



elements in continuous rotations in Southern and Western 

 Uganda. East African Agr. and Forestry J. 34:401-417. 



154. Stevenson, F. J. 1965- Origin and distribution of nitrogen in 



soil. p. 1-42 in W. V. Bartholomew and F. E. Clark (eds.). 

 Soil Nitrogen. Amer. Soc. Agron. Madison, WI. 



155. Stewart, F. B. I969. The effects of spacing and fertilization on 



yield of southern peas. J. Amer. Soc. Hort. Sci. 94:337-338. 



156. , and M. Reed. I969. Effect of fertilization on 



yield, growth, and mineral composition of southern peas. J. 

 Amer. Soc. Hort. Sci. 94:358-360. 



157' Strout, A. M. 1975' Some definitional problems with multiple- 

 crop diversification. The Ptiil. Econ. J. 14:308-316. 



158. Suler, A. V. 1976. Mi^iiltits and maxi yields. War on Hunger 



10:7-11. 



159. Sutton, P. 1964. Response of collards to nitrogen, phosphorus, 



and potassium fertilization. Proc. Fla. State Hort. Soc. 

 77:186-189. 



160. Thompson, L. G., and W. K. Robertson. 1959. Effect of rotations, 



fertilizers, lime and green manure crops on crop yields and 

 on soil fertility. Fla. Agr. Expt. Sta. Bui. 614. 



161. Tucker, G. A., W. K. Llewelyn, and J. Nesmith. I968. Balance 



fertilization of vegetable crops through computerized inten- 

 sity and balanced soil testing. Proc. Fla, State Hort. "'■oc. 

 81:201-208. 



